Overview
The Honeywell 10102/1/1 is a fail-safe analog input module providing four configurable channels for 0(2)-10 V or 0(4)-20 mA signals. It supports both active loop powering and passive transmitter connection, with galvanic isolation between the analog inputs and the 24 VDC / 5 VDC supplies. Its 100 Ohm current input impedance and 26 VDC loop supply make it suitable for standard two-wire transmitter applications in safety-related control systems.
Signal Ranges and Input Impedance
Each channel accepts either 0-20 mA or 4-20 mA current, or 0-10 V / 2-10 V voltage signals. The current input impedance is 100 Ohm, while the voltage input impedance is 12.5 kOhm. Because of the low current input impedance, multiple 10102/1/1 modules must not be connected in parallel in the mA range, as this will distort the measured value.
Active and Passive Loop Powering
The module can operate actively, providing a separate 26 VDC, short-circuit protected supply per input, or passively, where the transmitter receives its supply from an external source. The active loop supply delivers up to 20 mA per channel, with a solid-state current limit above 20 mA. This arrangement simplifies wiring for two-wire transmitters while maintaining short-circuit protection.
Resolution, Accuracy, and Isolation
The analog-to-digital converter provides 12-bit resolution with a maximum inaccuracy of 0.75 percent. The analog inputs share a common 0 V reference but remain galvanically isolated from the 24 VDC and 5 VDC power rails. The module accepts input signals up to -150 percent or +200 percent of the selected range without damage.
Power Supply and Mechanical Fit
The module requires 5 VDC at 30 mA and 24 VDC at 175 mA, plus an additional 25 mA for each active input channel. It occupies 4 TE, 3 HE, equivalent to 4 HP, 3U in the rack. Configuration is supported by module key coding at hole A27 and pins C3, C19, C27, together with rack coding at blind stops C11, C23, C31 and large pin A27.
Parameter Summary
| Parameter | Specification |
|---|---|
| Brand | Honeywell |
| Model | 10102/1/1 |
| General type number | 10102/1/1 |
| Product type | Fail-safe analog input module |
| Number of channels | 4 |
| Current input range | 0-20 mA / 4-20 mA |
| Voltage input range | 0-10 V / 2-10 V |
| Current input resistance | 100 Ohm |
| Voltage input resistance | 12.5 kOhm |
| Maximum loop resistance | 1 kOhm |
| Loop powering | 26 VDC, short-circuit protected |
| Loop current limit | > 20 mA, solid state |
| A/D converter | 12-bit |
| Inaccuracy | ≤ 0.75% |
| Absolute maximum input signal | -150% / +200% of selected range |
| Power supply | 5 VDC 30 mA; 24 VDC 175 mA + 25 mA per active input |
| Isolation | Analog inputs isolated from 24 VDC and 5 VDC |
| Space requirement | 4 TE, 3 HE (4 HP, 3U) |
| Approvals | CE, TÜV, UL |
| Software versions | All |
| Module key coding | Hole A27; pins C3, C19, C27 |
| Rack key coding | Blind stops C11, C23, C31; large pin A27 |
Frequently Asked Questions
Q: Can several 10102/1/1 modules be wired in parallel for one 4-20 mA signal?
A: No. The 100 Ohm current input impedance prevents parallel connection in the mA range. If parallel mA operation is required, the 10102/1/2 analog input module should be used instead.
Q: When should the active or passive mode be selected?
A: Active mode is suitable when the module supplies the transmitter from its 26 VDC loop output. Passive mode applies when the transmitter already has its own supply and the module only measures the current or voltage signal.
Q: Does this module support smart transmitter communication requiring 250 Ohm loop impedance?
A: Not directly in its standard configuration, because its current input impedance is 100 Ohm. For non-redundant configurations requiring at least 250 Ohm loop impedance, a 10102/1/2 module combined with a 10305/1/1 module may be used.
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